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GB/T 11378-2025: Metallic coatings - Measurement of coating thickness - Profilometric method
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GB/T 11378: Evolution and historical versions
| Std ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status |
| GB/T 11378-2025 | English | 279 |
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Metallic coatings - Measurement of coating thickness - Profilometric method
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| GB/T 11378-2005 | English | 234 |
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Metallic coatings -- Measurement of costing thickness -- Profilometric method
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| GB/T 11378-1989 | English | 239 |
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Metallic coatings--Measurement of coating thickness--Profilometric method
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Standard similar to GB/T 11378-2025 GB/T 9799 | GB/T 11376 | GB/T 9793 | GB/T 11372 | Basic data | Standard ID | GB/T 11378-2025 (GB/T11378-2025) | | Description (Translated English) | Metallic coatings - Measurement of coating thickness - Profilometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | A29 | | Classification of International Standard | 25.220.40 | | Word Count Estimation | 14,156 | | Date of Issue | 2025-10-31 | | Date of Implementation | 2026-05-01 | | Older Standard (superseded by this standard) | GB/T 11378-2005 | | Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China | GB/T 11378-2025: Metallic coatings - Measurement of coating thickness - Profilometric method---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 25.220.40
CCSA29
National Standards of the People's Republic of China
Replaces GB/T 11378-2005
Metal Coating Thickness Measurement Profilometer Method
(ISO 4518.2021, MOD)
Published on 2025-10-31
Implemented on May 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface III
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Principle 1
5.Instrument – Operating Parameters and Measurement Characteristics 1
5.1 Types of Contour Recorders 1
5.2 Stylus-type instruments 2
5.3 Inductive measurement probe or displacement sensor 2
5.4 Optical profilometer 2
6.Factors affecting accuracy 3
6.1 Contour Recording 3
6.2 Vertical magnification (applicable only to instruments with chart recorders) 3
6.3 Graphical Measurement 3
6.4 Applied Force Magnitude (Applicable only to profilometers with styluses) 3
6.5 Stylus Diameter and Surface Roughness 3
6.6 Surface Roughness 4
6.7 Vibration 4
6.8 Surface curvature 4
6.9 Cleanliness 4
6.10 Temperature 4
6.11 Step outline 4
6.12 Reference Surface (applicable only to profilometers with styluses) 4
6.13 Accuracy Calibration 4
7.Instrument Calibration 4
8.Experimental Procedure 5
8.1 Step Preparation 5
8.2 Contour Recording 5
8.3 Thickness Measurement 5
8.4 Measurement accuracy 6
9 Test Report 6
References 7
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document supersedes GB/T 11378-2005 "Metallic Coating Thickness Measurement - Profilometer Method", and is consistent with GB/T 11378-
Compared to.2005, aside from structural adjustments and editorial changes, the main technical changes are as follows.
---Added profile recorder types (see 5.1);
---Some provisions regarding stylus-type instruments have been amended (see 5.2, 4.2 of the.2005 edition);
---The measurement characteristics of the profilograph have been changed (see 5.2.4, 4.2.2 in the.2005 version);
---Some descriptions of inductive measurement probes or displacement sensors have been changed (see 5.3, 4.3 in the.2005 edition);
---Added equipment specifications for the optical profilometer (see 5.4);
---The applicable range of vertical magnification has been expanded (see 6.2);
---Some provisions regarding graphic measurements have been revised (see 6.3, 5.3 in the.2005 edition);
---The applicable range and requirements for the magnitude of the applied force have been expanded (see 6.4);
---Added some specifications for surface roughness (see 6.6);
---Some vibration specifications have been revised (see 6.7, 5.6 in the.2005 edition);
---Some provisions regarding surface curvature have been revised (see 6.8, 5.7 in the.2005 edition);
---The scope of application of the datum has been expanded (see 6.12);
---Some requirements for step preparation have been changed (see 8.1, 7.1 in the.2005 edition);
---Added requirements for the outline recording section (see 8.2);
---Added requirements for thickness measurement (see 8.3);
---The accuracy requirements for overburden thickness measurement have been changed (see 8.4, 7.4 in the.2005 edition);
---Added test report requirements (see Chapter 9).
This document is modified to adopt ISO 4518.2021 "Metallic coatings - Coating thickness measurement - Profilometer method".
The technical differences between this document and ISO 4518.2021, and the reasons therefor, are as follows.
---The vertical magnification requirement has been changed (see 6.2) to improve operability and facilitate the application of this document;
---The vibration requirements have been revised (see 6.7) to increase operability and facilitate the application of this document;
---The surface curvature requirements have been changed (see 6.8) to increase operability and facilitate the application of this document;
---The cleanliness requirements have been revised (see 6.9) to improve operability and facilitate the application of this document;
---The room temperature requirement has been changed (see 6.10) to improve operability and facilitate the application of this document;
---The requirements for creating the step outline have been revised (see 6.11) to increase operability and facilitate the application of this document;
---The requirements for the standard blocks used in calibrating instruments have been changed (see 7.2) to improve data accuracy;
---ISO 2177 (see 8.1.3) has been replaced with the normatively referenced GB/T 4955 to adapt to my country's technical conditions;
---Thickness measurement requirements have been changed (see 8.3) to improve data accuracy;
---The requirements for test reports have been changed (see Chapter 9) to adapt to my country's technical conditions.
The following editorial changes have been made to this document.
---ISO 2064 has been replaced by GB/T 12334 (see 8.1.3), which is cited in the informational reference.
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Standardization of Metallic and Non-metallic Coatings (SAC/TC57).
This document was drafted by. Wuhan Institute of Materials Protection, China Academy of Machinery Science and Technology, and Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences.
Cheng Research Institute, Dongfang Electric Group Dongfang Turbine Co., Ltd., China Southern Power Grid Co., Ltd. Ultra-High Voltage Transmission Company Nanning Bureau,
Zhejiang Yaoliang Energy Technology Co., Ltd.
The main drafters of this document are. Chen Pian, Li Hua, Long Bin, Chen Yaping, Wang Wei, Zeng Weichao, Bai Rundong, Huang Xiwang, Feng Bin, and Xue Jianqiang.
This document was first published in 1989, revised for the first time in.2005, and this is the second revision.
Metal Coating Thickness Measurement Profilometer Method
1 Scope
This document describes a method for forming a step between the surface of the coating layer and the surface of the base metal, and then measuring the step using a profile recorder.
The method for determining the thickness of a metallic coating based on height is described, and the characteristics of the instrument and the special measurement procedures for the profilometer method are specified.
This document applies to measuring metallic coatings with a thickness of 0.01 μm to 1000 μm on flat surfaces. With appropriate measures, it can also...
This document describes the measurement of the thickness of the metallic coating on a cylindrical surface. It also applies to the measurement of the thickness of standard coating sheets.
This document is not applicable to the measurement of minute coating thicknesses less than 0.01 μm with low flatness and smoothness of the working surface.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 4955 Metallic Coatings - Coating Thickness Measurement - Anodic Dissolution Coulometric Method (GB/T 4955-2005, ISO 2177.
2003, IDT)
3 Terms and Definitions
This document does not contain any terms or definitions that need to be defined.
4.Principles
Dissolve a portion of the coating layer (acceptance inspection) or cover a portion of the substrate before plating (production inspection) to form a step, marked with a contour.
The recorder measures the height of the step.
5.Instrument – Operating Parameters and Measurement Characteristics
5.1 Types of Contour Recorders
The following three types of instruments can all be used.
a) Stylus-type instruments, namely surface analyzers and surface profile recorders, are typically used to measure surface roughness, but are referred to as such in this document.
To record the outline of the steps;
b) An inductive measurement probe or displacement sensor (incremental or absolute value) capable of recording the profile of the step;
c) Optical profilometers, such as white light interferometers or confocal microscopes (ordinary, laser scanning, or color), are typically used to measure surfaces.
Topographic information and three-dimensional surface roughness, but in this document, it is used to record and evaluate the profile of the step.
Stylus-type instruments have a wider range of applications, capable of measuring surface roughness and shape, while the measuring probes or displacement sensors are structurally simpler.
Contact instruments designed for surface roughness have a thickness measurement range of 0.005 μm to 250 μm, while other contact instruments have a maximum thickness measurement range of...
The diameter is approximately 1000 μm.
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